Dataframe commands name (#457)

* corrected missing shellerror type

* batch dataframe commands

* removed option to find declaration with input

* ordered dataframe folders

* dataframe command name

crates/nu-command/src/dataframe/append.rs

@@ -12,7 +12,7 @@ pub struct AppendDF;
 
 impl Command for AppendDF {
     fn name(&self) -> &str {
-        "append-df"
+        "dataframe append"
     }
 
     fn usage(&self) -> &str {
@@ -30,8 +30,8 @@ impl Command for AppendDF {
         vec![
             Example {
                 description: "Appends a dataframe as new columns",
-                example: r#"let a = ([[a b]; [1 2] [3 4]] | to df);
+                example: r#"let a = ([[a b]; [1 2] [3 4]] | dataframe to-df);
-$a | append-df $a"#,
+$a | dataframe append $a"#,
                 result: Some(
                     NuDataFrame::try_from_columns(vec![
                         Column::new("a".to_string(), vec![1.into(), 3.into()]),
@@ -46,8 +46,8 @@ $a | append-df $a"#,
             Example {
                 description: "Appends a dataframe merging at the end of columns",
                 //example: r#"let a = ([[a b]; [1 2] [3 4]] | to df); $a | append-df $a -col"#,
-                example: r#"let a = ([[a b]; [1 2] [3 4]] | to df);
+                example: r#"let a = ([[a b]; [1 2] [3 4]] | dataframe to-df);
-$a | append-df $a --col"#,
+$a | dataframe append $a --col"#,
                 result: Some(
                     NuDataFrame::try_from_columns(vec![
                         Column::new(

crates/nu-command/src/dataframe/column.rs

@@ -12,7 +12,7 @@ pub struct ColumnDF;
 
 impl Command for ColumnDF {
     fn name(&self) -> &str {
-        "column"
+        "dataframe column"
     }
 
     fn usage(&self) -> &str {
@@ -28,7 +28,7 @@ impl Command for ColumnDF {
     fn examples(&self) -> Vec<Example> {
         vec![Example {
             description: "Returns the selected column as series",
-            example: "[[a b]; [1 2] [3 4]] | to df | column a",
+            example: "[[a b]; [1 2] [3 4]] | dataframe to-df | dataframe column a",
             result: Some(
                 NuDataFrame::try_from_columns(vec![Column::new(
                     "a".to_string(),

crates/nu-command/src/dataframe/command.rs

@@ -0,0 +1,37 @@
+use nu_engine::get_full_help;
+use nu_protocol::{
+    ast::Call,
+    engine::{Command, EngineState, Stack},
+    Category, IntoPipelineData, PipelineData, ShellError, Signature, Value,
+};
+
+#[derive(Clone)]
+pub struct Dataframe;
+
+impl Command for Dataframe {
+    fn name(&self) -> &str {
+        "dataframe"
+    }
+
+    fn usage(&self) -> &str {
+        "Dataframe commands"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build(self.name()).category(Category::Custom("dataframe".into()))
+    }
+
+    fn run(
+        &self,
+        engine_state: &EngineState,
+        _stack: &mut Stack,
+        call: &Call,
+        _input: PipelineData,
+    ) -> Result<PipelineData, ShellError> {
+        Ok(Value::String {
+            val: get_full_help(&Dataframe.signature(), &Dataframe.examples(), engine_state),
+            span: call.head,
+        }
+        .into_pipeline_data())
+    }
+}

crates/nu-command/src/dataframe/describe.rs

@@ -17,7 +17,7 @@ pub struct DescribeDF;
 
 impl Command for DescribeDF {
     fn name(&self) -> &str {
-        "describe-df"
+        "dataframe describe"
     }
 
     fn usage(&self) -> &str {
@@ -31,7 +31,7 @@ impl Command for DescribeDF {
     fn examples(&self) -> Vec<Example> {
         vec![Example {
             description: "dataframe description",
-            example: "[[a b]; [1 1] [1 1]] | to df | describe-df",
+            example: "[[a b]; [1 1] [1 1]] | dataframe to-df | dataframe describe",
             result: Some(
                 NuDataFrame::try_from_columns(vec![
                     Column::new(

crates/nu-command/src/dataframe/drop.rs

@@ -13,7 +13,7 @@ pub struct DropDF;
 
 impl Command for DropDF {
     fn name(&self) -> &str {
-        "drop-df"
+        "dataframe drop"
     }
 
     fn usage(&self) -> &str {
@@ -29,7 +29,7 @@ impl Command for DropDF {
     fn examples(&self) -> Vec<Example> {
         vec![Example {
             description: "drop column a",
-            example: "[[a b]; [1 2] [3 4]] | to df | drop-df a",
+            example: "[[a b]; [1 2] [3 4]] | dataframe to-df | dataframe drop a",
             result: Some(
                 NuDataFrame::try_from_columns(vec![Column::new(
                     "b".to_string(),

crates/nu-command/src/dataframe/dtypes.rs

@@ -10,7 +10,7 @@ pub struct DataTypes;
 
 impl Command for DataTypes {
     fn name(&self) -> &str {
-        "dtypes"
+        "dataframe dtypes"
     }
 
     fn usage(&self) -> &str {
@@ -24,7 +24,7 @@ impl Command for DataTypes {
     fn examples(&self) -> Vec<Example> {
         vec![Example {
             description: "Dataframe dtypes",
-            example: "[[a b]; [1 2] [3 4]] | to df | dtypes",
+            example: "[[a b]; [1 2] [3 4]] | dataframe to-df | dataframe dtypes",
             result: Some(
                 NuDataFrame::try_from_columns(vec![
                     Column::new(

crates/nu-command/src/dataframe/mod.rs

@@ -1,7 +1,9 @@
+mod series;
 mod values;
 
 mod append;
 mod column;
+mod command;
 mod describe;
 mod drop;
 mod dtypes;
@@ -10,6 +12,7 @@ mod to_df;
 
 pub use append::AppendDF;
 pub use column::ColumnDF;
+pub use command::Dataframe;
 pub use describe::DescribeDF;
 pub use drop::DropDF;
 pub use dtypes::DataTypes;
@@ -31,6 +34,7 @@ pub fn add_dataframe_decls(working_set: &mut StateWorkingSet) {
     bind_command!(
         AppendDF,
         ColumnDF,
+        Dataframe,
         DataTypes,
         DescribeDF,
         DropDF,

crates/nu-command/src/dataframe/open.rs

@@ -14,7 +14,7 @@ pub struct OpenDataFrame;
 
 impl Command for OpenDataFrame {
     fn name(&self) -> &str {
-        "open-df"
+        "dataframe open"
     }
 
     fn usage(&self) -> &str {
@@ -63,7 +63,7 @@ impl Command for OpenDataFrame {
     fn examples(&self) -> Vec<Example> {
         vec![Example {
             description: "Takes a file name and creates a dataframe",
-            example: "open-df test.csv",
+            example: "dataframe open test.csv",
             result: None,
         }]
     }

crates/nu-command/src/dataframe/series/mod.rs

@@ -0,0 +1 @@
+

crates/nu-command/src/dataframe/to_df.rs

@@ -11,7 +11,7 @@ pub struct ToDataFrame;
 
 impl Command for ToDataFrame {
     fn name(&self) -> &str {
-        "to df"
+        "dataframe to-df"
     }
 
     fn usage(&self) -> &str {
@@ -26,7 +26,7 @@ impl Command for ToDataFrame {
         vec![
             Example {
                 description: "Takes a dictionary and creates a dataframe",
-                example: "[[a b];[1 2] [3 4]] | to df",
+                example: "[[a b];[1 2] [3 4]] | dataframe to-df",
                 result: Some(
                     NuDataFrame::try_from_columns(vec![
                         Column::new("a".to_string(), vec![1.into(), 3.into()]),
@@ -38,7 +38,7 @@ impl Command for ToDataFrame {
             },
             Example {
                 description: "Takes a list of tables and creates a dataframe",
-                example: "[[1 2 a] [3 4 b] [5 6 c]] | to df",
+                example: "[[1 2 a] [3 4 b] [5 6 c]] | dataframe to-df",
                 result: Some(
                     NuDataFrame::try_from_columns(vec![
                         Column::new("0".to_string(), vec![1.into(), 3.into(), 5.into()]),
@@ -58,7 +58,7 @@ impl Command for ToDataFrame {
             },
             Example {
                 description: "Takes a list and creates a dataframe",
-                example: "[a b c] | to df",
+                example: "[a b c] | dataframe to-df",
                 result: Some(
                     NuDataFrame::try_from_columns(vec![Column::new(
                         "0".to_string(),
@@ -74,7 +74,7 @@ impl Command for ToDataFrame {
             },
             Example {
                 description: "Takes a list of booleans and creates a dataframe",
-                example: "[$true $true $false] | to df",
+                example: "[$true $true $false] | dataframe to-df",
                 result: Some(
                     NuDataFrame::try_from_columns(vec![Column::new(
                         "0".to_string(),

crates/nu-engine/src/documentation.rs

@@ -273,7 +273,7 @@ fn get_flags_section(signature: &Signature) -> String {
             if let Some(short) = flag.short {
                 if flag.required {
                     format!(
-                        "  -{}{} (required parameter){:?} {}\n",
+                        "  -{}{} (required parameter) {:?} {}\n",
                         short,
                         if !flag.long.is_empty() {
                             format!(", --{}", flag.long)
@@ -298,7 +298,7 @@ fn get_flags_section(signature: &Signature) -> String {
                 }
             } else if flag.required {
                 format!(
-                    "  --{} (required parameter){:?} {}\n",
+                    "  --{} (required parameter) {:?} {}\n",
                     flag.long, arg, flag.desc
                 )
             } else {